Improvement in the manufacture of stop-cocks



UNITED STATES PATENT OFFICE.

JOSEPH L. LOWRY, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN THE MAN UFACTURE OF STOP-COCKS.

T 0 all whom it may concern:

Beit known that I, Josnrn L. LowRY, of the city of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Stop- Cocks; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.

My invention relates to an improvement in the construction of that class of stop-cocks used for shutting olf the How of water in street-mains,77 or pipes used for conveying water through the streets of cities, and for other-purposes; and it consists in forming a stop cock of cast-iron, with brass-faced iron valves and valve-seats therein in such a manner as to obviate the necessity of fitting,77 and at the same time make a better and more perfect job, which I accomplish by first casting the rings for facing the valves and valve-seats of composition or brass, with a dovetail projection thereon, and then placing them, when so cast, in the mold wherein the molten iron is to be poured, which, as it comes in contact with the dovetail projection on the facings of the valve and valveseats, partially fuses the same and unites them with the iron forming the body of the stop-cock in a cheap, durable, and effective manner.

Mylifting-screw, Figure 5, is made by taking a round bar of wrought or other iron of sufcient length and thickness and passing it through a screw-cutting machine for the purpose of cutting a thread on it and taking the scale off. The rod or bar is then heated, but not so hot as to raise a scale. It is then placed in the mold and the brass or composition cast round it. Previous to the rod being placed in the flask or mold it is dusted with boraX or other material that will assist in fusing the iron and composition. The iron is heated, so as not to chill the composition or brass and the more readily fuse with it, and incooling shrink with the composition or brass. The object in cutting a thread or recess on the iron bar is to give additional surface for the composition to fuse withtheiron, andin case that the composition should fail tofuse with the iron it willbe so interlaced with the iron by threads or recesses interlocking each other that the composition cannot be stripped oft' the iron rod ore screw. The dovetails on the rings for facing the valve and valve-seat are to give additional surface for the two metals to imite or fuse. Should the metals fail to fuse, the dovetail being interlocked, the brass ring or faceis secured to the iron in the valve or valve-seat.

To enable others skilled in the art to understand and make my invention, I will proceed to describe its construction by reference to the l accompanying drawings, in which- Fig.'l represents a side elevation of a stopcock. Figf2 is a transverse vertical section of the same. Fig. 3 represents two stop-cocks attached to a cross-pipe. Fig. 4 is an enlarged vertical section of afour-way cock, with firehydrant7 attached. The brass face of the valveseat, being toward theinterior of the stop-cock, cannot be seen, but the brass face ofthe valve is seen, a part of the stop-cock chamber being cut away for that purpose. A part of the brass ring or valve-face being cut away, so as to show the manner the brass face (l is united to the cast-iron of the valve. Fig. 5 represents a transverse verticalsection of the lifting-screw. Fig. 6 represents a section of a disk, showing the old method of attaching the brass face to the iron for a valve. Fig. 7 represents the same with my improved method of securing the brass face to the valve. Fig. i 8 represents a ring or valve-seat having the f brass attached according to my plan, part of 1 which is broken away to show the dovetail.

All the drawings are lettered, and similar ,f letters indicate like parts on all the figures.

The brass or composition rings or valve-fa f ings G and facings for the valve seats Gf, having been cast with the dovetail R, the scale is taken oi' by scraping or pickeling, a proper recessr having been made in the cock-pattern for the reception of the dovetail, so that the brass can lay close. The pattern and ring are then placed in a ilask and the sand rammed around the pattern, as for other work. The flask being opened and the pattern taken out, the gates 7 are cut, so as to prevent as much as possible the current of metal (which in temperature is tour times greater than molten brass) from cutting or washin g away the rings. Previous, however, to closing the ask for the purpose of eastin g the iron care must be taken that no sand is left on that part of the brass rings intended to imite with the iron, but must be dusted over with borax or any other substance that will ux and assist the fusion andA Weldingof the dovetail on the rings to the iron in the 'valve and valve-seat. The mold being closed, the iron should not be poured in too hot, but time should be given to enable it to cool to that degree that it will barely ow into the mold, using for that purpose soft gray iron with open pores, the heat of the iron being graduated-that is, raised or lowered, as the composition of bra-ss is hard or soft- When brass and iron will be found perfectly united.

The body of the. cock being in other respects similar to the ordinary cocks used for this purpose, a description thereof is herein JOSEPH L. LOWRY.

Witnesses J osIAH W. ELLs, R. A. CAMERON. 

